tools/gdm-control/gdm-control.c (raw)
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#include <string.h> #include <stdio.h> #include <assert.h> #include <errno.h> #include <unistd.h> #include <sys/socket.h> #include <sys/un.h> #include <X11/Xlib.h> #include <X11/Xauth.h> #include <glib.h> typedef enum { INVALID, NONE, SHUTDOWN, REBOOT, SUSPEND, SWITCHUSER } Action; #define GDM_PROTOCOL_SOCKET_PATH1 "/var/run/gdm_socket" #define GDM_PROTOCOL_SOCKET_PATH2 "/tmp/.gdm_socket" #define GDM_PROTOCOL_MSG_CLOSE "CLOSE" #define GDM_PROTOCOL_MSG_VERSION "VERSION" #define GDM_PROTOCOL_MSG_AUTHENTICATE "AUTH_LOCAL" #define GDM_PROTOCOL_MSG_QUERY_ACTION "QUERY_LOGOUT_ACTION" #define GDM_PROTOCOL_MSG_SET_ACTION "SET_SAFE_LOGOUT_ACTION" #define GDM_PROTOCOL_MSG_FLEXI_XSERVER "FLEXI_XSERVER" #define GDM_ACTION_STR_NONE GDM_PROTOCOL_MSG_SET_ACTION" NONE" #define GDM_ACTION_STR_SHUTDOWN GDM_PROTOCOL_MSG_SET_ACTION" HALT" #define GDM_ACTION_STR_REBOOT GDM_PROTOCOL_MSG_SET_ACTION" REBOOT" #define GDM_ACTION_STR_SUSPEND GDM_PROTOCOL_MSG_SET_ACTION" SUSPEND" #define GDM_MIT_MAGIC_COOKIE_LEN 16 static int fd = 0; static void gdm_disconnect() { if (fd > 0) close(fd); fd = 0; } static char* get_display_number(void) { char *display_name; char *retval; char *p; display_name = XDisplayName(NULL); p = strchr(display_name, ':'); if (!p) return g_strdup ("0"); while (*p == ':') p++; retval = g_strdup (p); p = strchr (retval, '.'); if (p != NULL) *p = '\0'; return retval; } static char* gdm_send_protocol_msg (const char *msg) { GString *retval; char buf[256]; char *p; int len; p = g_strconcat(msg, "\n", NULL); if (write (fd, p, strlen(p)) < 0) { g_free (p); g_warning ("Failed to send message to GDM: %s", g_strerror (errno)); return NULL; } g_free (p); p = NULL; retval = NULL; while ((len = read(fd, buf, sizeof(buf) - 1)) > 0) { buf[len] = '\0'; if (!retval) retval = g_string_new(buf); else retval = g_string_append(retval, buf); if ((p = strchr(retval->str, '\n'))) break; } if (p) *p = '\0'; return retval ? g_string_free(retval, FALSE) : NULL; } static gboolean gdm_authenticate() { FILE *f; Xauth *xau; const char *xau_path; char *display_number; gboolean retval; if (!(xau_path = XauFileName())) return FALSE; if (!(f = fopen(xau_path, "r"))) return FALSE; retval = FALSE; display_number = get_display_number(); while ((xau = XauReadAuth(f))) { char buffer[40]; /* 2*16 == 32, so 40 is enough */ char *msg; char *response; int i; if (xau->family != FamilyLocal || strncmp (xau->number, display_number, xau->number_length) || strncmp (xau->name, "MIT-MAGIC-COOKIE-1", xau->name_length) || xau->data_length != GDM_MIT_MAGIC_COOKIE_LEN) { XauDisposeAuth(xau); continue; } for (i = 0; i < GDM_MIT_MAGIC_COOKIE_LEN; i++) g_snprintf(buffer + 2*i, 3, "%02x", (guint)(guchar)xau->data[i]); XauDisposeAuth(xau); msg = g_strdup_printf(GDM_PROTOCOL_MSG_AUTHENTICATE " %s", buffer); response = gdm_send_protocol_msg(msg); g_free (msg); if (response && !strcmp(response, "OK")) { /*auth_cookie = g_strdup(buffer);*/ g_free(response); retval = TRUE; break; } g_free (response); } fclose(f); return retval; } static gboolean gdm_connect() { struct sockaddr_un addr; char *response; assert(fd <= 0); fd = socket(AF_UNIX, SOCK_STREAM, 0); if (fd < 0) { g_warning("Failed to create GDM socket: %s", g_strerror (errno)); gdm_disconnect(); return FALSE; } if (g_file_test(GDM_PROTOCOL_SOCKET_PATH1, G_FILE_TEST_EXISTS)) strcpy(addr.sun_path, GDM_PROTOCOL_SOCKET_PATH1); else strcpy(addr.sun_path, GDM_PROTOCOL_SOCKET_PATH2); addr.sun_family = AF_UNIX; if (connect(fd, (struct sockaddr *) &addr, sizeof (addr)) < 0) { g_warning("Failed to establish a connection with GDM: %s", g_strerror(errno)); gdm_disconnect(); return FALSE; } response = gdm_send_protocol_msg(GDM_PROTOCOL_MSG_VERSION); if (!response || strncmp(response, "GDM ", strlen("GDM ") != 0)) { g_free(response); g_warning("Failed to get protocol version from GDM"); gdm_disconnect(); return FALSE; } g_free(response); if (!gdm_authenticate()) { g_warning("Failed to authenticate with GDM"); gdm_disconnect(); return FALSE; } return TRUE; } int main(int argc, char **argv) { int i; Action a = INVALID; for (i = 1; i < argc; ++i) { if (!strcmp(argv[i], "--help")) { a = INVALID; break; } if (!strcmp(argv[i], "--none")) { a = NONE; break; } if (!strcmp(argv[i], "--shutdown")) { a = SHUTDOWN; break; } if (!strcmp(argv[i], "--reboot")) { a = REBOOT; break; } if (!strcmp(argv[i], "--suspend")) { a = SUSPEND; break; } if (!strcmp(argv[i], "--switch-user")) { a = SWITCHUSER; break; } } if (!a) { printf("Usage: gdm-control ACTION\n\n"); printf("Actions:\n"); printf(" --help Display this help and exit\n"); printf(" --none Do nothing special when the current session ends\n"); printf(" --shutdown Shutdown the computer when the current session ends\n"); printf(" --reboot Reboot the computer when the current session ends\n"); printf(" --suspend Suspend the computer when the current session ends\n"); printf(" --switch-user Log in as a new user (this works immediately)\n\n"); return 0; } { char *d, *response; const char *action_string; d = XDisplayName(NULL); if (!d) { fprintf(stderr, "Unable to find the X display specified by the DISPLAY " "environment variable. Ensure that it is set correctly."); return 1; } switch (a) { case NONE: action_string = GDM_ACTION_STR_NONE; break; case SHUTDOWN: action_string = GDM_ACTION_STR_SHUTDOWN; break; case REBOOT: action_string = GDM_ACTION_STR_REBOOT; break; case SUSPEND: action_string = GDM_ACTION_STR_SUSPEND; break; case SWITCHUSER: action_string = GDM_PROTOCOL_MSG_FLEXI_XSERVER; break; default: assert(0); } if (gdm_connect()) { response = gdm_send_protocol_msg(action_string); g_free(response); gdm_disconnect(); } } return 0; } |